[PATCH] D71774: [RISCV] Optimize seteq/setne pattern expansions for better code size

[weiwei via Phabricator via llvm-commits]

wwei added a comment.

The case was from dhrystone(dhry_2.c):

  Boolean Func_3 (Enum_Par_Val)
  /***************************/
      /* executed once        */
      /* Enum_Par_Val == Ident_3 */
  
  Enumeration Enum_Par_Val;
  {
    Enumeration Enum_Loc;
    Enum_Loc = Enum_Par_Val;
    if (Enum_Loc == Ident_3)
      /* then, executed */
      return (true);
    else /* not executed */
      return (false);
  } /* Func_3 */

I found gcc will have better code size (c.addi + sqez) than llvm (xori + sqez), so this patch try to implement the same optimization.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D71774/new/

https://reviews.llvm.org/D71774